Electronic payment

During electronic payment, I get the error as in the attached photo.
How is this to be solved?

This section is for Add-ons support and the error you’ve send is most probably not related to addons (I would guess antivirus or anti-malware application may interfere with Firefox).

It may be better to ask this on Reddit where you have a better chance that someone will be able to help you:

Thanks for the help.